Kaki colored bag with "USN U Gas Mask ND Mark III" printed in black on bag. There is a flap over the top with metal snaps and a connected shoulder strap. There is a litle cylinder strapped into the bottom of the bag.

The "ND" stands for "Navy Diaphragm." This diaphragm allowed the wearer to communicate while wearing the mask. It also had eyepieces shaped to enhance peripheral vision. The filter canister was suspended behind the neck, which allowed more freedom while working on the ship. This mask was designed to protect against toxic gases, vapors, dust, and smoke. This protection lasted as long as the canister was functioning properly and the seal was maintained. It did not protect the wearer from carbon monoxide, ammonia, carbon dioxide or tritium. The Mark III was manufactured in significant numbers, but it was replaced in only two years by the Mark IV, which was manufactured towards the end of WWII.

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